The effect of dielectric environment on the brightening of neutral and charged dark excitons in WSe2 monolayer

被引：9

作者：

Zinkiewicz, Malgorzata ^{[1
]}

Grzeszczyk, Magdalena ^{[1
]}

Kipczak, Lucja ^{[1
]}

Kazimierczuk, Tomasz ^{[1
]}

Watanabe, Kenji ^{[2
]}

Taniguchi, Takashi ^{[3
]}

Kossacki, Piotr ^{[1
]}

Babinski, Adam ^{[1
]}

Molas, Maciej R. ^{[1
]}

机构：

[1] Univ Warsaw, Inst Expt Phys, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland

[2] Natl Inst Mat Sci, Res Ctr Funct Mat, 1-1 Namiki, Tsukuba 3050044, Japan

[3] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, 1-1 Namiki, Tsukuba 3050044, Japan

来源：

APPLIED PHYSICS LETTERS | 2022年 / 120卷 / 16期

关键词：

COMPLEXES; BIEXCITON;

D O I：

10.1063/5.0085950

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The dielectric environment of atomically thin monolayer (ML) of semiconducting transition metal dichalcogenides affects both the electronic bandgap and the excitonic binding energy in the ML. We investigate the effect of the environment on the in-plane magnetic field brightening of neutral and charged dark exciton emissions in the WSe2 ML. The monolayers placed in three dielectric environments are studied, in particular, the ML encapsulated in hexagonal BN (hBN) flakes, the ML deposited on a hBN layer, and the ML embedded between the hBN flake and SiO2/Si substrate. We observe that the brightening rates of the neutral and charged dark excitons depend on the dielectric environment, which may be related to the variation of the level of carrier concentration in the ML. Moreover, the surrounding media, characterized by different dielectric constants, weakly influence the relative energies of the neutral and charged dark excitons in reference to the bright ones. Published under an exclusive license by AIP Publishing.

引用

页数：5